Abstract:To investigate the effects of high-humidity air impingement （HHAI） on the quality of Rosa roxburghii Tratt.powder （RRTP）,this study measured the moisture content,color difference,total phenols,total flavonoids,antioxidant activity,bulk density,microstructure,and other physiochemical properties of RRTP at different HHAI treatment times （0,30,90,150,and 210 s）.The results showed that as the HHAI treatment time was increased,the color difference of RRTP was gradually increased,the L* value was gradually decreased,the a* value was increased,and the b* value was in an increasing to decreasing trend.The hygroscopicity and caking degree were also increased.The moisture content was below 5%,conducive to product storage.At 30 s of treatment,RRTP exhibited the best quality characteristics：a total phenol content of 73.29 mg/g,an ABTS+ free radical scavenging rate of 50.81%,a DPPH free radical scavenging rate of 88.92%,a water retention of 8.02 g/g,and an oil retention of 2.04 mL/g,with ideal blending performance.In conclusion,short-term（30 s） HHAI treatment could significantly enhance the antioxidant activity of the RRTP,while maintaining its excellent physicochemical properties and thermal stability,exhibiting ideal application potential.